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Cable force estimation of a long‐span cable‐stayed bridge with microwave interferometric radar
Computer-Aided Civil and Infrastructure Engineering ( IF 9.6 ) Pub Date : 2020-06-02 , DOI: 10.1111/mice.12557
Wenju Zhao 1 , Guangwei Zhang 1 , Jian Zhang 2
Affiliation  

Since cables are the critical structural components for ensuring the overall structural integrity and safety of cable‐stayed bridges, the portable and rapid cable force measurement has a very important practical significance in the bridge health monitoring. In this paper, a method of simultaneous and continuous estimation of the forces of multiple cables using a self‐developed microwave interferometric radar was proposed. In the proposed approach, first, the time‐varying modal frequencies are identified by the Hilbert transform algorithm from the displacements of multiple cables, which are monitored by the self‐developed radar, and then, the time‐varying cable forces are obtained by the vibration method. In addition, for the problem of multiple cables located in the same range bin when distance test or the test angle is nonideal, a single‐channel blind source separation algorithm based on vibrational mode decomposition (VMD) and time‐frequency analysis was proposed to separate the cable signals. Furthermore, a method based on the spectrum correlation coefficients was proposed to determine the number of decomposition layers in VMD. The “Nanjing Eye” cable‐stayed footbridge was used to conduct field measurement to validate the proposed method. Field measurement results show a good agreement with reference measurements, which demonstrate that the proposed method can perform well in an actual project for portable and rapid cable force estimation.

中文翻译:

微波干涉雷达估算大跨度斜拉桥索力

由于电缆是确保斜拉桥整体结构的完整性和安全性的关键结构部件,因此便携式,快速的电缆力测量在桥梁健康监测中具有非常重要的实际意义。本文提出了一种利用自行研制的微波干涉雷达同时连续估算多根电缆力的方法。在提出的方法中,首先,通过希尔伯特变换算法从多根电缆的位移中识别出随时间变化的模态频率,这些位移由自行开发的雷达监测,然后,通过振动法。另外,对于距离测试或测试角度不理想的多条电缆位于同一范围内的问题,提出了一种基于振动模态分解(VMD)和时频分析的单通道盲源分离算法来分离电缆信号。此外,提出了一种基于频谱相关系数的方法来确定VMD中分解层的数量。使用“南京眼”斜拉式人行桥进行现场测量以验证所提出的方法。现场测量结果与参考测量结果吻合良好,表明所提出的方法可以在实际项目中很好地进行便携式和快速电缆力估算。提出了一种基于频谱相关系数的方法来确定VMD中分解层的数量。使用“南京眼”斜拉式人行桥进行现场测量以验证所提出的方法。现场测量结果与参考测量结果吻合良好,表明所提出的方法可以在实际项目中很好地进行便携式和快速电缆力估算。提出了一种基于频谱相关系数的方法来确定VMD中分解层的数量。使用“南京眼”斜拉式人行桥进行现场测量以验证所提出的方法。现场测量结果与参考测量结果吻合良好,表明所提出的方法可以在实际项目中很好地进行便携式和快速电缆力估算。
更新日期:2020-06-02
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